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Accounting Policies - Impact of CECL Standard Adoption (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019	Jun. 30, 2020	Jan. 01, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Off-balance sheet credit exposures	$ 689		$ 689		$ 318	$ 662
Other					0
Total allowance for credit losses					3,060
Retained earnings	45,947		45,947		42,215
Income taxes from continuing operations	166	$ 255	128	$ 706
Total commercial
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Off-balance sheet credit exposures	582		582		316	548
Total consumer
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Off-balance sheet credit exposures	$ 107		$ 107		2	114
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2016-13
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Off-balance sheet credit exposures					179		$ 179
Other							19
Total allowance for credit losses					700		661
Retained earnings							(671)
Fair Value - Assets					200
Income taxes from continuing operations					200
Cumulative Effect, Period of Adoption, Adjustment | Total commercial | Accounting Standards Update 2016-13
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Off-balance sheet credit exposures					53
Cumulative Effect, Period of Adoption, Adjustment | Total consumer | Accounting Standards Update 2016-13
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Off-balance sheet credit exposures					126
Cumulative Effect, Period of Adoption, Adjusted Balance
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Off-balance sheet credit exposures					497	662	497
Other							19
Total allowance for credit losses							3,721
Retained earnings							$ 41,544
Cumulative Effect, Period of Adoption, Adjusted Balance | Total commercial
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Off-balance sheet credit exposures					369	548
Cumulative Effect, Period of Adoption, Adjusted Balance | Total consumer
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Off-balance sheet credit exposures					$ 128	$ 114

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